import matplotlib.pyplot as plt
import  pandas as pd
df=pd.read_excel('学生各学期成绩表.xlsx')
plt.figure(figsize=(10,8))
x = df['序号']
y = df['语文']
plt.rcParams['font.sans-serif']='SimHei'
plt.title('学生各学期分析')
plt.xlabel('学期')
plt.ylabel('成绩')
for a,b in zip (df['序号'],df['语文']):
    plt.text(a,b,'%.1f'%b,ha='center')
plt.grid(axis='y')
plt.xticks(range(11),df['学期'],rotation=15)
plt.plot(x,y)
plt.legend(('语文',))
plt.show()